Unveiling the phonon scattering mechanisms in half-Heusler thermoelectric compounds,Energy & Environmental Science

当前位置： X-MOL 学术 › Energy Environ. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Unveiling the phonon scattering mechanisms in half-Heusler thermoelectric compounds
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-11-19 , DOI: 10.1039/d0ee03014g
Ran He _{1,

2,

3} , Taishan Zhu _{4,

5,

6,

7} , Yumei Wang _{8,

9,

10,

11} , Ulrike Wolff _{1,

2,

3} , Jean-Christophe Jaud _{3,

12,

13,

14} , Andrei Sotnikov _{1,

2,

3} , Pavel Potapov _{1,

2,

3} , Daniel Wolf _{1,

2,

3} , Pingjun Ying _{1,

2,

3} , Max Wood _{4,

7,

15,

16} , Zhenhui Liu _{1,

2,

3,

17,

18} , Le Feng _{1,

2,

3,

17,

18} , Nicolas Perez Rodriguez _{1,

2,

3} , G. Jeffrey Snyder _{4,

7,

15,

16} , Jeffrey C. Grossman _{4,

5,

6,

7} , Kornelius Nielsch _{1,

2,

3,

17,

18} , Gabi Schierning _{1,

2,

3}

Affiliation

Leibniz Institute for Solid State and Materials Research
Dresden
Germany
Department of Materials Science and Engineering
Massachusetts Institute of Technology
Cambridge
USA
Institute of Physics
Chinese Academy of Sciences
Beijing 100190
China
Department of Materials and Earth Sciences
Technical University of Darmstadt
Darmstadt
Northwestern University
Evanston
Institute of Materials Science
Technical University of Dresden

Half-Heusler (HH) compounds are among the most promising thermoelectric (TE) materials for large-scale applications due to their superior properties such as high power factor, excellent mechanical and thermal reliability, and non-toxicity. Their only drawback is the remaining-high lattice thermal conductivity. Various mechanisms were reported with claimed effectiveness to enhance the phonon scattering of HH compounds including grain-boundary scattering, phase separation, and electron–phonon interaction. In this work, however, we show that point-defect scattering has been the dominant mechanism for phonon scattering other than the intrinsic phonon–phonon interaction for ZrCoSb and possibly many other HH compounds. Induced by the charge-compensation effect, the formation of Co/4d Frenkel point defects is responsible for the drastic reduction of lattice thermal conductivity in ZrCoSb_1−xSn_x. Our work systematically depicts the phonon scattering profile of HH compounds and illuminates subsequent material optimizations.

中文翻译：

揭示半赫斯勒热电化合物中的声子散射机理

Half-Heusler（HH）化合物因其优越的特性（例如高功率因数，出色的机械和热可靠性以及无毒性）而成为最有希望用于大规模应用的热电（TE）材料。它们唯一的缺点是保持高的晶格热导率。据报道，各种机制均能有效增强HH化合物的声子散射，包括晶界散射，相分离和电子-声子相互作用。然而，在这项工作中，我们证明了点缺陷散射是声子散射的主要机制，而不是ZrCoSb以及可能还有许多其他HH化合物的固有声子-声子相互作用。由电荷补偿效应引起，_{1− x} Sn_x。我们的工作系统地描绘了HH化合物的声子散射曲线，并阐明了随后的材料优化。

更新日期：2020-11-25

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11